Cutting mechanism.



L. A.' SCHMIDT.

y CUTTING MECHANISKM. lAPPLICATION FILED 050.12. 1911.

Patented July 27, 1915.

6, l2. I3. l

, le. /6' Il!! 1V" 1 .1

LOUIS A. SCHMIDT, OF NEW YORK, N. Y., ASSIGNOR T R. HOE AND CO., 0F NEW YORK;

N. Y., .A CORPORATION 0F NEW YORK.

' CUTTING MEoHAm-SM.

Specification of Letters Patent.

rammed .rally 2a, i915.

Application led December 12, 1911. Serial No. 665,275.

To all lwhom it may concern."

block.

Be itknown that I, LoUIs A. SCHMIDT, a citizen of the United States, residing at New York, county of Kings, and State ofNew York, have invented certain new and useful Improvements in Cutting Mechanisms, fully described and represented in the following specification and the accompanying dra-wings, forming a part of the same.

'This invention lrelates to improvements in machines for cutting paper andA other similar material..

In the cutting -mechanisms which form a part of fast rotary printing machines the cutting knife operates againsty a cutting It was formerly customary to form this cutting block of wood. The speed of printing machines has, in late yearsbeen increased to such an extent that the wood was not found to be sufficiently durable and there was substituted therefor a cutting block composed mainly of wood but having a sheet of thin rubber secured to its face. This construction was found to be an improvement, -because the rubber formed a better grlpping surface for the, paper and vbecause it prevented wear of the wood on each side of the kmfe at the time of cutting. These composite blocks have of late been largely re placed by a block made entirely of rubber or rubber composition, these blocks being held in troughs ory boxes bymeans of screws wluch entered and held the blocks in the boxes or held the boxes together. In order to avoid weakening the rubber a large number of these screws were employed, sixteen screws being ordinarily employed on one cutting block. The holes for this large number of screws were expensive to make, and,

further, considerable time was necessarily involved yin changing one of these blocks when it wore out. Again, as rubber has become increasingly expensive the cost of replacing these rubber or composition blocks when worn has correspondingly increased.

-The present invention has for its object to provide an improved elastic, cutting block for paper cutting machines, the construction of the block and of the vholding' means employed in connection therewith being of such a character as to reduce the cost of both the block and holder, and also to reduce the time incident to changing a block when necessary on account of wear.

With this'and other objects not specifically referred to in view, the inivention consists in certain constructions. and in certain parts, improvements and combinations as will be hereinafter fully described and then specifically pointed out.

In the accompanying drawingsz-Figure 1 represents a side elevation. partly in sec-f tion, of a portion of the cutting cylinder of a. rotary printing machine embodying the invention. Fig. 2 is a plan view of the cutting block construction shown n Fig. 1. Fig. 3 is a longitudinal section of the construction illustrated in Fig. 2.- Fig. 4 is a sectional View of parts of the cutting cylinders of a printing machine, showing the means employed 'for mounting the knife may be of any suitable construction. As shown, the cylinder 2 is provided with a box Sin which is located a knife 4.-. Spring mounted wooden cheek-pieces 5 are located on each side of the knife, as common in such constructions.

- The cutting block employed in carrying -theinvention into effect will be of elastic material, such as rubber composition, the block employed being illustrated at 6. This block 'is formed on its sides with rentrant angular recesses, the surfaces of these recesses being marked 7 In constructions embodying the invention, the block will be held in position by .a holder the walls of which present salient angular projections,l these projections being indicated at 8. When the block is in position, these salient angles engage the surfaces 7 of the block and hold it firmly in position.

en the constructionA is to be embodied in new machines, as a rule the holder will be formed by a recess in the block carrier,

the salient angular holding projections be-` ing located directly on the walls of the recess 9 in which the block is located. `When, however, the construction is to be embodied in machines already in operation and which are provided with the usual block receiving recesses, such as indicated at 10, in Fig.. 5, the retaining projections 8 will be formed on the side walls of boXes 11 which will be inserted into the recesses referred to. In either case, the holder will be an' integral open endedstructure so that the block can be removed simply by sliding it out'.

In the best constructions embodying the invention, these rentrant angular recesses will be formed substantially midway 'between the other two sides or the top and bottom of the block, so `that the block, when it becomes Worn' on one side may be turned over, thus presenting a fresh cutting surface to the knife. Further, when the block is thus turned oven-'the wear which the block has received on the side which has been operative, does not substantially. reduce ,the strength of the block, because of the supporting action of the salient angular projections.

It will be further seen that the construction lends itself readily to renewing or reversing the block, because the block can be readily slid into and out of its receiving recess, so that the time necessarily employed for replacing the block is greatly reduced as compared with the/old construction.

y Suitable means may be employed to prevent'the block from shifting endwise when with a bridge piece 16 heldin position byl in position, and two methods of thus preventingY shifting are illustrated. Referring more particularly to the constructions shown lin Figs. 2 and 3, a filling block 12 is employed, the sides of this block being formed f with rentrant'angles sol that it may slip 4into the block holdingrecess at one end.

This filling block-is prevented from coming out of the recess by a bridge piece 13 held in position by screws 14. The block isso positioned that one end abuts against this filling block and is held in that position by a screw, as 15, which engages the other end of the block.

According to the construction illustrated in Figs. 6 and 7, which is particularly applicable to the construction o f holder illustrated in Fig. 2, the cylinder is provided screws 17. 'A filling block 18 is provided, this block being recessed on its top, as shown, so, as to engage the bridge piece 16. This block .is held in position in the`holder by a screw 19. When the cutting block is in po- Sition it bears at one end against this filling block v18 and-may be held thereagainst by a screw 20 whichmay be the screw which se cures the box l1 in position in the cylinder. Changes and variations may be made 1n the construction by whlch' the mvention V*claimed .is carried into effect. The invention claimed, therefore, .is not t0. be confined to the p rticular constructions herein described and illustrated in the accompanying drawings.

What is claimed is 1. An elastic cutting block for machines for cutting paper and similar material, said block having rentrant angular recesses in its sides in combination with an integral open-ended holder having retaining walls .formed with salient angles which engage the surfaces of said rentrant angles when the blockl is in position, said block being slidable longitudinally into and out of the holder through the open end of said holder.

2. An elastic cutting block for machines a0 for cutting paper and similar material, said block having rentrant angular recesses inl its sides in combination with an integral open-ended holder having retalning walls formed with salient angles which engage the 'B5 its sides, said recesses being located substantially midway between the other faces of ther block, in combination with an integral openended holder having retaining walls formed with salient angles which engage the surfaces of said rentrant angles when the block 100 is in position, said block being slidable longitudinally into and vkout of the holder through the open end of said holder. v

4. An elastic cutting block for machines for cutting paper and' similar material, said g 105 block having Arentrant angular recesses in its sides, said recesses being located substantially midway between the other faces of the block, in combination with an integral openended holder having retaining walls formed with salient angles which engage the surfaces of said rentrant angles when the block is in position, said block being slidable longitudinally into and out of the holder through the open end of said holder, and.115

removable means for preventing endwise shifting of tle block. l

5. An elastic cutting block .for machines Afor cutting paper and similar material, said block having rentrant angular recesses in its sides, in combination with a cylinder provided with an ppenended recess to receive the block, 'the walls ofsaid recess being formed with salient angles which engage the surfaces of the rentrant angles when the 125 block is in position in .the recess, said block being slidab'le longitudinally into and out" of the recess in the cylinder through the .open end of said recess.

6. An elastic cutting block for machmes 130.

preventing endwise 90 for cutting paper and similar material, said block having reentrant/ angular recesses 1n its sides, 1n combination with a cylinder provided with an open-ended recess to receive the block, the walls of said recess being formed with salient angles which engage the sui-faces of the rentrant angles when the block is in position in the recess, said block being slidable longitudinally into and out 10 of the recess in the cylinder through the In testimony whereof, I have hereunto set my hand, in the presence'of two subscribing 15- witnesses.

. LOUIS A. SCHMIDT. Witnesses: v

RICHARD KELLY, f JOHN LYNCH. 

